<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
</head>
<body>
	 <form action="">
		 <!-- required  必填的 autocomplete="off/on" 自动开启补全功能 属性要生效必须有两个前提 
			1. 必须有name属性
			2. 必须成功提交过一次
			-->
		 <input type="text" required name="uname" autocomplete="off">
		 <input type="submit">
	 </form>
</body>
</html>